I had an idea after reading about someone wanting to have an actor on the ceiling. I'm not sure if anyone has ever attempted something like this but I thought it might just be do-able. Take a look at the drawing I put together to illustrate how my idea might be implemented and let me know if yall think this could work.

It will work, we did a similar illusion one year. Our guest walked on a 2x6 laying on the floor with 4x8 ft mirrors on each side of it,we put a static dummy in the rafters of the building around 15 ft up with a strobe light on him,then we used pallets to build the sides up to the dummys location to make a "shaft". the refection looked as though you were crossing a Deep cavern with only a 2x6 to walk on, very scary to some people & highly recommended.
Slaughter.

I figured it would work, just have to get the correct angle on the mirrors. Could save a lot of energy laying down instead of hanging, and no risk of cutting of circulation. Wish I had room to put this together. If anyone else has ever done this or something simular, I'dlike to see some pictures.

Mylar is big no no! It was attempted last year and it just wrinkles too easily. Any ripple destroys the illusion, you really need mirrored acrylic to get the best effect. We're installing one this year.